To better understand how social inequalities are produced, scholars should be aware of the multidimensionality of life courses and of the interdependency between life domains. Specifically, how changes introduced in one life domain can affect – sometimes unintentionally – other life domains. In this review, we summarise empirical causal evidence on policy spillover effects. We focus on studies covering two life pathways from childhood to adulthood, and from education to the labour market, covering spillover effects between the life domains of education, family, and employment.